1220790809 has 8 divisors (see below), whose sum is σ = 1411999680. Its totient is φ = 1033784496.

The previous prime is 1220790797. The next prime is 1220790811. The reversal of 1220790809 is 9080970221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220790809 - 2¹² = 1220786713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220790209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1050014 + ... + 1051175.

It is an arithmetic number, because the mean of its divisors is an integer number (176499960).

Almost surely, 2^1220790809 is an apocalyptic number.

It is an amenable number.

1220790809 is a deficient number, since it is larger than the sum of its proper divisors (191208871).

1220790809 is an equidigital number, since it uses as much as digits as its factorization.

1220790809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101279.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1220790809 is about 34939.8169571622. The cubic root of 1220790809 is about 1068.7605553989.

The spelling of 1220790809 in words is "one billion, two hundred twenty million, seven hundred ninety thousand, eight hundred nine".